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src/main/java/linux/general/hackyquizbot/QuizBackend.java

@@ -2,144 +2,76 @@ package linux.general.hackyquizbot;
 
 import java.sql.Connection;
 import java.sql.DriverManager;
+import java.sql.ResultSet;
 import java.sql.SQLException;
+import java.sql.Statement;
 import java.util.ArrayList;
 
 public class QuizBackend {
 
 	private static final String dbUsername = Main.getCommandLineArgument(1);
 	private static final String dbPassword = Main.getCommandLineArgument(2);
-	private static final String dbName = "jdbc:mariadb://localhost:3306/quizbot"; //we can make this configurable later
+	private static final String dbName = "jdbc:mariadb://localhost/quizbot"; //we can make this configurable later
+	private static Connection dbConnection;
+	private static Statement statement;
 
 	// CREATE TABLE questions(id INT(32) AUTO_INCREMENT PRIMARY KEY, question TEXT, max_score INT(8));
-	// CREATE TABLE answer_coices(id INT(32), answer VARCHAR(2048), correctness BOOLEAN);
+	// CREATE TABLE answer_choices(id INT(32), answer VARCHAR(2048), correctness BOOLEAN);
 	// CREATE TABLE user_answers(id INT(32), given_answer VARCHAR(2048), discord_user VARCHAR(1024));
 	// CREATE TABLE categories(id INT(32), category VARCHAR(1024));
 
 	private static Question[] allQuestions;
-	private static String[] categories;
+	private static ArrayList<String> categories;
 	
 	static {
-		try (Connection connection = DriverManager.getConnection(dbName, dbUsername, dbPassword)) {
+		
-		    System.err.println("Database connected!");
+		categories = new ArrayList<String>();
+		try {
+			dbConnection = DriverManager.getConnection(dbName, dbUsername, dbPassword);
+		    System.err.println("Database connected.");
+			statement = dbConnection.createStatement();
+			System.err.println("Statement object created.");
+			// populate categories
+			ResultSet resultSet = statement.executeQuery("SELECT category FROM categories;");
+			while (resultSet.next()) {
+				String category = resultSet.getString("category");
+				if (!categories.contains(category)) {
+					categories.add(category);
+				}
+			}
+			System.err.print("Loaded categories:");
+			for (int i = 0; i<categories.size(); i++) {
+				System.err.print(" " + categories.get(i));
+			}
+			System.err.println();
+			//TODO: populate allQuestions
 		}
 		catch (SQLException e) {
-			System.err.println("Could not connect to DB.");
+			System.err.println("Error while interacting with DB.");
 			e.printStackTrace();
+			System.exit(1);
 		}
-		//TODO: populate allQuestions
-		//TODO: populate categories
 	}
 	
 	public static String[] getCategories() {
-		return categories;
+		return (String[]) categories.toArray();
 	}
 
-	public static Question getRandomQuestionForCategory(String category) {
+
-		//TODO: loop
+	//TODO: user aware random question picker
-			//TODO: pick random question
-			//TODO: check if question is in category, return if it is
-		return null;
-	}
 	
-	public static Question getNewRandomQuestionForCategory(String discordUserID, String category) {
+	//TODO: function to determine whether a user should get more questions
-		//TODO: get list of previously displayed questions for that user
+	
-			//TODO: retrieve list of answers that user has given to get the question IDs from there
+	//TODO: function to get a user’s score
-		//TODO: find a random question that isn’t on said list
-		//TODO: add the question to said list and return it
-		return null;
-	}
-
-	public static int getScoreForUser(String discordUserID) {
-		int score = 0;
-		//TODO: iterate over all questions
-			//TODO: get achieved score for the user for the question
-			//TODO: add to score
-		return score;
-	}
 
 	public static class Question {
 		
-		private String text;
+		//TODO: get full question text with multiple choice answers
-		private char[] validAnswers;
-		private char[] correctAnswers;
-		private int scoreValue;
-		private int ID;
-		private ArrayList<String> categories = new ArrayList<String>();
-		
-		/**
-		 * @param ID unique ID for the question
-		 * @param question The string for the question text
-		 * @param answers The multiple choice answers
-		 * @param mask A mask to be laid over answers to decide which answers are correct and which aren’t
-		 * @param scoreValue See getQuestionScoreValue()
-		 */
-		public Question(int ID, String question, String[] answers, boolean[] mask, int scoreValue) {
-			//TODO: build text, valid answers and correct answers
-			this.ID = ID;
-			this.scoreValue = scoreValue;
-		}
-		
-		//TODO: need a way to get back from the answer letter to the text answer and vice versa
-		
-		public boolean isInCategory(String category) {
-			for (int i=0; i<this.categories.size(); i++) {
-				if (this.categories.get(i).equals(category)) return true;
-			}
-			return false;
-		}
-		
-		public void addCategory(String category) {
-			this.categories.add(category);
-		}
 
-		/**
+		//TODO: get possible answers (scrambled per user)
-		 * @return the full question text including multiple choice options with letters that correspond to getValidResponses()
-		 */
-		public String getQuestionTextWithOptions() {
-			return text;
-		}
-
-		/**
-		 * @return a character array containing all the valid answers
-		 */
-		public char[] getValidResponses() {
-			return this.validAnswers;
-		}
 		
-		/**
+		//TODO: get correct answers (scrambled per user)
-		 * @return a character array containing all the correct answers
-		 */
-		public char[] getCorrectResponses() {
-			return this.correctAnswers;
-		}
-
-		/**
-		 * This is used to send the user’s reply back to the backend. Can be called
-		 * multiple times to add answers for questions with multiple possible answers.
-		 * 
-		 * @param discordUserID
-		 * @param answer
-		 */
-		public void addAnswer(String discordUserID, char answer) {
-			//TODO: store question ID, user ID, and the chosen answer
-		}
-
-		/**
-		 * Used to balance easy and difficult questions. Difficult questions will have a
-		 * higher value so if someone gets a bunch of them they will get less questions
-		 * overall.
-		 * 
-		 * @return
-		 */
-		public int getQuestionScoreValue() {
-			return this.scoreValue;
-		}
 		
-		public int getAchievedScore(String discordUserID) {
+		//TODO: submit answer
-			//TODO: retrieve given answers by user ID and question ID
-			//TODO: calculate score
-			return 0;
-		}
 	}
 }